Concrete-reinforcing bar.



. 25 e "of the-bar which is of angular crosssection NITED' STA' 'llE$ P T OFFICE.

f DANIEL Kenn, or. Yotmcis'rown, 01110.;

To'all whom it may concern r Be it; known that I, DANIEL Kenn, of

' Youngstown, county of Mahoning, Stateof Ohio, hare invented. a new" and useful Iniprovenient 1n Concrete-Reinforcing Bars. of

[which the followin is a full, clear, and exact description, reterence being bad to the accompanying drawings, forming part-of this speclfication, in -Wh1ch.

Figure 1 is a side elevation of a portion a bar embodying my invention; Fig. 2 is a 3 more fullypointed0ut.

Referring to panyin the... the numeral-2 designates the .body portion with a longitudinal rib or projection3. at

each ofzits four corners, each longitudinal rib or projection having an. inwar s p. in or'beveled face 4. 1

ach of the four faces of the, bar s formedwith a seriesof longitudinally ex};

tending corrugations,- of' which 5 indicates the high points and 6the low points, .Each' corrugation has av gradual slope from its. high point to adjacent low points, as clearly seen in- Fig. 2, the high points of the corrugations preferably rising to about the plane of the: outer. edges of the corner ribs or" projections 3. The corrugations form a series of alternating ridges and pockets or recesses, the latter by reason of the inward slope or bevel of the corner ridges or prosloping forrn. i

The high and low point ,of thecorrngations at. opposite sides of the bar are'directl; opposite each other,an d the high and low points of the corrugations at the other two'sides of the bar are arranged to'alternate jections having all I four sides or walls of 1 therewith. In other words, considering the bar as a whole, the high and low points .on

one side are respectively midway of the high and low points of the corrugations on the two adjacent sides. By reason of the sloping form of the 'corrugationsand the altercorrormrn-nmnronoms BAR.

Specification of Letters Patent. a lication filed February 23, 1911.

.figures, while Fig. 4 shows a tangular cross'section.

has elation to concrete re- Serial Nb. 610,366. 1

. Patented Apr. 9, 19i2.

nating arrangement thereof, it will be seen that the bar has the same cross sectional area throughout itslcngth, although the forlnof the cross section is diiferent at difier'ent points, as will appear reference to Figs. 3, tand 5. Thus, Figs. 3 and 5 are of substantially I-bca1n cross section with the axes at right angles to each other in the two generally rec- The bar beingof uniform cross sectional area throughout its length, there is no waste of steel for bonding purposes. The sloping faces of the corrugations, as well as the slop-- 'ing inner faces of the corner ridges or projections make the bar free from sharp corners of a nature to exert a splitting or wedging action upon the concrete. At the same tin1e, this form of the corrugations effectually stops any tendency of'the bar to-turn or moveendwise" in the concrete, since it opposes an equal resistance to the inoreinent in all directions. t .flhe form of the-bar gives it a maximum area of bondlng surface in proportion to itsfcross sectional area. The longitudinal arrangement of'the corrugations, as distingiiished from the transverse arrangement commonly employed, not only makes the rolling ofthe bar much easier, but it also results in an increaseinthe tensile strength }of the bar for; an equal cross sectional area.

Where transverse corrugations are employed, the more or less abrupt bending of the steel intothe corrugations appears to injuriously ,afi'ect the fiber of the steel, and

to avoid this is one of the objects of my invention.

While I prefer to einbodj iny invention in the form. illustrated in the drawing, namely, in a four-sidedv bar, it will be obvious that the invention is applicable to bars having three sides or more than four sides.

I claim: I v v g 11. A concrete reinforcing bar having a -:co ntinuou's bonding surface formed by a series of achonnng depressions, each de res-- Lee sion having four sloping faces, said aces sloping from the .face of the bar to the bottom of the depressions, the inclined sides of each depression, which extend in-a longitudinal direction, converging into like sloping faces of the adjoining depressions; substantially as described.

2; A concrete reinforcing bar having a pluralityof continuous bonding faces, each of said faces having a series of adjoining v depressions, each depression having four sloping'faces, said faces sloping from the face of'the bar to the bottom of the depressions, the inclined sides of each depression,

which extend in a longitudinal direction,

scribed;

' 3. A rectangular concrete reinforcing bar having a plurality of bonding surfaces, each surface having a'plurality of adjoining deressions and each de ression havin four "sloping faces, said faces sloping from the face of the bar to the bottom of the depressions, the inclined sides of each depression, Which extend in a longitudinal direc-' tion, converging into like-sloping faces of 1 the adjoining depressions; substantially as .20

described.

' 4. A square concrete reinforcing bar having adjoining bonding depressions in each face thereof, each of the depressions having four sloping faces sloping from the edge of the bar to the bottom of the depressions, the inclined sides of each depression, which extend in a longitudinal direction, converging into like sloping faces of the adjoining depressions, the depressions on opposite sides of the bar being diametrically opposite to eachother and the depressions on the other two sides being staggered with relation thereto; substantially as described.

In testimony whereof, I have hereunto set my hand.

DANIEL KERR.

Vitnesses:

NELLIE CREBBONS, JOHN F? IILARB. 

